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rails--rails/activesupport/lib/module_attribute_accessors.rb

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1.2 KiB
Ruby

# Extends the module object with module and instance accessors for class attributes,
# just like the native attr* accessors for instance attributes.
class Module # :nodoc:
def mattr_reader(*syms)
syms.each do |sym|
class_eval <<-EOS
if ! defined? @@#{sym.id2name}
@@#{sym.id2name} = nil
end
def self.#{sym.id2name}
@@#{sym}
end
def #{sym.id2name}
@@#{sym}
end
def call_#{sym.id2name}
case @@#{sym.id2name}
when Symbol then send(@@#{sym})
when Proc then @@#{sym}.call(self)
when String then @@#{sym}
else nil
end
end
EOS
end
end
def mattr_writer(*syms)
syms.each do |sym|
class_eval <<-EOS
if ! defined? @@#{sym.id2name}
@@#{sym.id2name} = nil
end
def self.#{sym.id2name}=(obj)
@@#{sym.id2name} = obj
end
def self.set_#{sym.id2name}(obj)
@@#{sym.id2name} = obj
end
def #{sym.id2name}=(obj)
@@#{sym} = obj
end
EOS
end
end
def mattr_accessor(*syms)
mattr_reader(*syms)
mattr_writer(*syms)
end
end